/*
 * Copyright 1999-2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 

package org.apache.taglibs.standard.lang.jstl;

/**
 *
 * <p>The implementation of the plus operator
 * 
 * @author Nathan Abramson - Art Technology Group
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: pierred $
 **/

public class PlusOperator
  extends ArithmeticOperator
{
  //-------------------------------------
  // 单例
  //-------------------------------------

  public static final PlusOperator SINGLETON =
    new PlusOperator ();

  //-------------------------------------
  /**
   *
   * 构造函数
   **/
  public PlusOperator ()
  {
  }

  //-------------------------------------
  // Expression methods
  //-------------------------------------
  /**
   *
   * Returns the symbol representing the operator
   **/
  public String getOperatorSymbol ()
  {
    return "+";
  }

  //-------------------------------------
  /**
   *
   * Applies the operator to the given double values, returning a double
   **/
  public double apply (double pLeft,
		       double pRight,
		       Logger pLogger)
  {
    return pLeft + pRight;
  }
  
  //-------------------------------------
  /**
   *
   * Applies the operator to the given double values, returning a double
   **/
  public long apply (long pLeft,
		     long pRight,
		     Logger pLogger)
  {
    return pLeft + pRight;
  }
  
  //-------------------------------------
}
